Beef Keftas with Tabbouleh and Sumac Sauce

Ingredients

• ½ cup (125 ml) mayonnaise
• ½ cup (125 ml) plain Greek yogurt
• 1 tsp ground sumac
• 1 cup (250 ml) water
• ¼ tsp salt
• 1 cup (180 g) fine bulgur
• 1 ½ cups (70 g) parsley, finely chopped
• 5 green onions, chopped
• 2 cups (280 g) cherry tomatoes, halved
• ¼ cup (60 ml) olive oil
• 1 lemon, juice only
• 10 mint leaves, finely chopped
• 1 garlic clove, chopped
• 1 lb (450 g) lean ground beef
• 2 garlic cloves, chopped
• 1 lemon, zest finely grated
• ½ tsp salt
• ½ tsp ground coriander
• ½ tsp ground cumin
• ½ tsp ground allspice
• Cayenne or Aleppo pepper, to taste